📖 amp-consent fullscreen restriction documentation (#26487)

* Added documentation

* Updated based on warning

* remove warning doc

* Update integrating-consent.md

extensions/amp-consent/integrating-consent.md

@@ -59,7 +59,7 @@ window.parent.postMessage(
 );
 ```
 
-Action `'enter-fullscreen'` requests the AMP runtime to expand the iframe to fullscreen.
+Action `'enter-fullscreen'` requests the AMP runtime to expand the iframe to fullscreen. `amp-consent` will only allow the iframe enter fullscreen if it detects user interaction with the iframe (e.g. clicking on the iframe).
 
 #### Informing Consent response